Polycarbonate resin composition

Abstract

Disclosed is a polycarbonate resin a composition. The polycarbonate resin composition may simply and exactly improve appearance properties such as yellow index (Y.I), haze and the like, and thermal stability during a high-temperature process, and provide processability by reducing gas generation during molding, through provision of a relational formula of addition amounts of a hindered phenol-based compound and a phosphite-based compound which function as antioxidants when mixed with the polycarbonate resin.

Claims

1. A polycarbonate resin composition comprising: a polycarbonate resin, a hindered phenol-based compound, and a phosphite-based compound, wherein the polycarbonate resin has an average molecular weight (Mw) in a range of 30,000 to 50,000 g/mol, wherein both the hindered phenol-based compound and the phosphite-based compound have T.sub.10%( C.), measured according to ASTM E2402 method, of 300 C. or more, respectively, wherein the hindered phenol-based compound and the phosphite-based compound are comprised in a content range satisfying Formula 1 below and Formula 2 below based on 100 parts by weight of the polycarbonate resin:
0.80y/(x+y)0.83[Formula 1]
0.25x+y0.30[Formula 2] wherein x is parts by weight of the hindered phenol-based compound and y is parts by weight of the phosphite-based compound, wherein the hindered phenol-based compound is one or more selected from the group consisting of pentaerythritol tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate] and 1,3,5-trimethyl-2,4,6-tris(3,5-di-t-butyl-4-hydroxy benzyl)benzene, wherein the phosphite-based compound is one or more selected from the group consisting of bis(2,4-di-t-butylphenyl) pentaerythritol diphosphite and bis(2,4-dicumylphenyl)pentaerythritol diphosphite, and wherein the polycarbonate resin composition has a total volatile organic compound (VOC, 300 C., 20 min) of 350 ppm or less.

2. The polycarbonate resin composition according to claim 1, wherein the composition is characterized in that a yellow index difference (YI) measured with ASTM D1925 is 0.20 or less and a haze measured with ASTM D1003 is 0.20 or less, when the composition is measured at 280 C. and 320 C.

3. The polycarbonate resin composition according to claim 1, wherein the composition is characterized in that a yellow index difference (YI) measured with ASTM D1925 is 0.10 to 0.20, and a haze measured with ASTM D1003 is 1.17 or less, when the composition is measured at 280 C. and 320 C.

4. The polycarbonate resin composition according to claim 1, wherein the composition is characterized in that a yellow index difference (YI) measured with ASTM D1925 is 0.10 to 0.20.

5. The polycarbonate resin composition according to claim 1, wherein the composition is characterized in that a yellow index difference (YI) measured with ASTM D1925 is 0.10 to 0.20 and a haze measured with ASTM D1003 is 1.17 or less, when the composition is measured at 280 C. and 320 C.

6. The polycarbonate resin composition according to claim 1, wherein the polycarbonate resin is an aliphatic or aromatic resin having a melt viscosity of 10 to 160 g/min.

7. The polycarbonate resin composition according to claim 1, wherein the composition comprises one or more additives selected from a lubricant, a light stabilizer, and an anti-hydrolysis agent.

8. The polycarbonate resin composition according to claim 1, wherein the composition is applied when injection molded or extrusion molded products are manufactured.

Description

BEST MODE

(1) Hereinafter, the present invention will be described in detail.

(2) The present invention is characterized by provision of a polycarbonate resin composition which may simply and exactly improve appearance properties such as yellow index (Y.I), haze and the like, and thermal stability during a high-temperature process, and provide processability by reducing gas generation during molding.

(3) In particular, the polycarbonate resin composition according to the present invention comprises a polycarbonate resin, a hindered phenol-based compound and a phosphite-based compound, wherein the polycarbonate resin composition comprises the hindered phenol-based compound and the phosphite-based compound in a content range satisfying Formula 1 below and Formula 2 below based on 100 parts by weight of the polycarbonate resin.
0.6y/(x+y)0.9[Formula 1]
0.05x+y0.5[Formula 2]

(4) wherein x is parts by weight of the hindered phenol-based compound and y is parts by weight of the phosphite-based compound.

(5) As an embodiment, Formula 1 may be a interaction formula between the hindered phenol-based compound and the phosphite-based compound, in which yellow index difference (YI) measured with ASTM D1925 is 0.20 or less and haze measured with ASTM D1003 is 0.20 or less, when the composition is processed at 280 C. and 320 C.

(6) As a specific embodiment, Formula 1 may be an interaction formula between the hindered phenol-based compound and the phosphite-based compound, wherein yellow index difference (YI) measured with ASTM D1925 is 0.10 to 0.20 and haze measured with ASTM D1003 is 0.09 to 0.20, when the composition is processed at 280 C. and 320 C.

(7) In addition, as an embodiment, Formula 2 may be a interaction formula between the hindered phenol-based compound and the phosphite-based compound, in which yellow index difference (YI) measured with ASTM D1925 is 0.10 to 0.20, haze measured with ASTM D1003 is 1.17 or less, and a total organic compound (VOC, 300 C., 20 min) is 350 ppm or less, when the composition is processed at 280 C. and 320 C.

(8) As a specific embodiment, Formula 2 may be a interaction formula between the hindered phenol-based compound and the phosphite-based compound, wherein yellow index difference (YI) measured with ASTM D1925 is 0.12 to 0.18, haze measured with ASTM D1003 is 0.09 to 1.17, and a total organic compound (VOC, 300 C., 20 min) is 350 ppm or less, when the composition is processed at 280 C. and 320 C.

(9) As an embodiment, the hindered phenol-based compound may be a compound wherein yellow index difference (YI) with measured ASTM D1925 is 0.10 to 0.20 and a total organic compound (VOC, 300 C., 20 min) is 350 ppm or less.

(10) As another embodiment, in the hindered phenol-based compound, T.sub.10%( C.) measured according to an ASTM E2402 method may be 300 C. or more, 300 to 375 C., or 349 to 365 C.

(11) As another embodiment, the hindered phenol-based compound may be one or more selected from pentaerythritol tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate], and 1,3,5-trimethyl-2,4,6-tris(3,5-di-t-butyl-4-hydroxy benzyl)benzene.

(12) As a specific embodiment, the hindered phenol-based compound may be Irganox-1010 available from BASF Corp. or ADK Stab AO-330 available from ADEKA Corp.

(13) As an embodiment, in the phosphite-based compound, yellow index difference (YI) measured with ASTM D1925 is 0.10 to 0.20 and haze measured with ASTM D1003 is 1.17 or less, and a total organic compound (VOC, 300 C., 20 min) is 350 ppm or less, when the composition is processed at 280 C. and 320 C.

(14) As another embodiment, in the phosphite-based compound, T.sub.10%( C.) measured according to an ASTM E2402 method may be 300 C. or more, 300 to 375 C., or 337 to 362 C.

(15) As yet another embodiment, the phosphite-based compound may be one or more selected from bis(2,4-di-t-butylphenyl)pentaerythritol diphosphite, and bis(2,4-dicumylphenyl)pentaerythritol diphosphite.

(16) As a specific embodiment, the phosphite-based compound may be ADK Stab PEP-24 available from ADEKA Corp. or DoverPhos S-9228 available from Dover Chemical Corp.

(17) As an embodiment, the polycarbonate resin may be an aliphatic or aromatic resin, and melt viscosity thereof may be 10 to 160 g/min, 10 to 80 g/min or 10 to 30 g/min.

(18) As an embodiment, average molecular weight (Mw) of the polycarbonate resin may be 14,000 to 50,000 g/mol, 20,000 to 50,000 g/mol, or 30,000 to 50,000 g/mol.

(19) The composition may comprise one or more additives selected from a conventionally used lubricant, light stabilizer, and anti-hydrolysis agent.

(20) The composition may be applied when injection or extrusion molded products are manufactured.

(21) Now, the present invention will be described in more detail with reference to the following examples. These examples are provided only for illustration of the present invention and should not be construed as limiting the scope and spirit of the present invention.

Example 1

(22) Based on 100 parts by weight of a polycarbonate resin, where melt viscosity is 22 g/min, having an average molecular weight of 41,000 g/mol, 0.05 parts by weight (x) of Irganox 1010 (corresponding to B1 in Table 1) having T.sub.10%( C.) of 365 C. measured according to an ASTM E2402 method as a hindered phenol-based compound and 0.15 parts by weight (y) of PEP-24 (corresponding to C1 in Table 1) having T.sub.10%( C.) of 337 C. measured according to an ASTM E2402 method as a phosphite-based compound were added to a 290 C. cylinder, where a calculated value of Formula 1 is 0.75 and a calculated value of Formula 2 is 0.20, and then prepared in a pellet form using a twin-screw extrusion kneader.

(23) The obtained polycarbonate resin composition, which was a pellet form, was injection-molded at 280 C. and 320 C., respectively, to obtain a specimen of 40803 mm (widthlengththickness). Physical properties of the specimen were measured as follows. Results are summarized in Table 2 below.

(24) <Physical Property Measurement>

(25) Haze: ASTM D1003

(26) Yellow index (YI): ASTM D1925

(27) Yellow index difference (YI)=YI (320 C.)YI (280 C.)

(28) Total volatile organic compound (VOC): purge and trap gas chromatography-mass spectrometry (during 20 minutes at 300 C.)

Example 2

(29) An experiment identical to Example 1 was performed, except that 0.08 parts by weight of DovorPhos S-9228 (y) having T.sub.10%( C.) of 337 C. (corresponding to C2 in Table 1) measured according to an ASTM E2402 method was alternatively used as a phosphite-based compound, where a calculated value of Formula 1 was 0.62 and a calculated value of Formula 2 was 0.13. Measured physical properties were summarized in Table 2 below.

Examples 3-6

(30) Experiments identical to Example 2 were performed, except that the amount (x) of the hindered phenol-based compound and the amount (y) of the phosphite-based compound were used as disclosed in Table 1. Measured physical properties were summarized in Table 2 below.

Example 7

(31) An experiment identical to Example 1 was performed, except that ADK Stab AO-330 (corresponding to B2 in Table 1) having T.sub.10%( C.) of 349 C. measured according to an ASTM E2402 method, as a hindered phenol-based compound, was used in an amount of 0.08 parts by weight (x), where a calculated value of Formula 1 is 0.75 and a calculated value of Formula 2 is 0.20. Measured physical properties were summarized in Table 2 below.

Comparative Examples 1 to 6

(32) Experiments identical to Example 1 were performed, except that the amount (x) of the hindered phenol-based compound and the amount (y) of the phosphite-based compound were used as disclosed in Table 1 below. Measured physical properties were summarized in Table 2 below.

(33) TABLE-US-00001 TABLE 1 Hindered Phos- phenol-based phite-based compound compound (x, parts by (y, parts by weight) weight) For- For- Item B1 B2 C1 C2 mula 1 mula 2 Example1 0.05 0.15 0.75 0.20 Example2 0.05 0.08 0.62 0.13 Example3 0.05 0.1 0.67 0.15 Example4 0.05 0.15 0.75 0.20 Example5 0.05 0.2 0.80 0.25 Example6 0.05 0.25 0.83 0.30 Example7 0.05 0.15 0.75 0.20 Comparative 0.2 0 0.00 0.20 Example1 Comparative 0.15 0.05 0.25 0.20 Example2 Comparative 0.1 0.1 0.50 0.20 Example3 Comparative 0 0.2 1.00 0.20 Example4 Comparative 0.01 0.02 0.67 0.03 Example5 Comparative 0.2 0.4 0.67 0.60 Example6

(34) TABLE-US-00002 TABLE 2 Item haze YI (280 C.) YI (320 C.) YI VOC (ppm) Example 1 0.10 0.62 0.80 0.18 256.1 Example 2 0.09 0.68 0.83 0.15 231.1 Example 3 0.12 0.63 0.78 0.15 234.8 Example 4 0.13 0.61 0.75 0.14 268.5 Example 5 0.14 0.61 0.73 0.12 321.0 Example 6 0.15 0.60 0.72 0.12 345.0 Example 7 0.12 0.59 0.75 0.16 311.1 Comparative 1.20 0.96 1.21 0.25 265.1 Example 1 Comparative 0.98 0.87 1.10 0.23 285.6 Example 2 Comparative 0.36 0.74 0.96 0.22 317.2 Example 3 Comparative 0.21 0.67 0.89 0.22 321.8 Example 4 Comparative 0.11 0.96 1.18 0.22 357.1 Example 5 Comparative 1.18 0.62 0.73 0.11 321.4 Example 6

(35) As shown in Table 2, when compared to Examples 1 to 7 satisfying Formula 1 and Formula 2, YI in each of Comparative Examples 1 to 4 satisfying Formula 2 and not satisfying Formula 1 is greater than 0.21 and thereby yellow index difference is poor. In particular, it can be confirmed that transmittances of Comparative Examples 1 to 3, where Formula 1 is 0.6 or less and a hindered phenol-based compound was used in more amount than a phosphite-based compound, is greater than 0.2, and thereby yellow index difference and transmittance are poor.

(36) In addition, it can be confirmed that YI of Comparative Example 5, where Formula 2 is less than 0.05, of Comparative Examples 5 and 6 satisfying Formula 1 and not satisfying Formula 2, is greater than 0.21 and thereby yellow index is poor, and transmittance of Comparative Example 6, where Formula 2 is greater than 0.5, is greater than 0.2 and thereby transmittance is poor.

Additional Experimental Examples 1-5

(37) Experiments identical to Example 1 were performed, except that the hindered phenol-based compound was substituted with Irganox 1076 (available from BASF Corp. and corresponding to B3 in Table 3) having T.sub.10%( C.) of 291 measured according to an ASTM E2402 method or Cyanox 425 (available from Cytec Industries Inc. and corresponding to B4 in Table 3) having T.sub.10%( C.) of 268 measured according to an ASTM E2402 method, and the phosphite-based compound was substituted with Irganox 168 (available from BASF Corp. and corresponding to C3 in Table 3) having T.sub.10%( C.) of 271 measured according to an ASTM E2402 method, ADK Stab PEP-36 (available from ADEKA Corp. and corresponding to C4 in Table 3) having T.sub.10%( C.) of 286 measured according to an ASTM E2402 method or Hostanox P-EPQ (available from Clariant International Ltd. and corresponding to C5 in Table 3) having T.sub.10%( C.) of 258 measured according to an ASTM E2402 method in amount ranges disclosed in Table 3 below. Measured physical properties were summarized in Table 4 below.

(38) TABLE-US-00003 TABLE 3 Hindered phenol- Phosphite- based compound based compound (x, parts by weight) (y, parts by weight) For- For- Item B1 B2 B3 B4 C1 C2 C3 C4 C5 mula 1 mula 2 Additional 0.05 0.15 0.75 0.20 Experimental Example1 Additional 0.05 0.15 0.75 0.20 Experimental Example2 Additional 0.05 0.15 0.75 0.20 Experimental Example3 Additional 0.05 0.15 0.75 0.20 Experimental Example4 Additional 0.05 0.15 0.75 0.15 Experimental Example5

(39) TABLE-US-00004 TABLE 4 Item haze YI (280 C.) YI (320 C.) YI VOC (ppm) Additional 0.11 0.71 0.93 0.22 539.2 Experimental Example 1 Additional 0.14 0.74 0.96 0.22 592.9 Experimental Example 2 Additional 0.12 0.73 1.11 0.38 565.3 Experimental Example 3 Additional 0.12 0.65 0.82 0.17 518.8 Experimental Example 4 Additional 0.14 0.67 0.97 0.30 589.1 Experimental Example 5

(40) As shown in Table 4, when compounds having T.sub.10%( C.) of less than 300 as a hindered phenol-based compound or a phosphite-based compound are used in Additional Experimental Examples 1 to 5 satisfying conditions of Formulas 1 and 2, excessive gas generation occurs due to a VOC content of 500 ppm or more. In addition, the majority of Additional Experimental Examples exhibits a poor result such as YI of greater than 0.21. Such a phenomenon is considered as being occurred by poor thermal stability through excessive gas consumption.